Pyrex

[2] Pyrex made its public debut in 1915 during World War I, positioned as an American-produced alternative to Duran.

While some people have thought that it was made up from the Greek pyr and the Latin rex, we have always taken the position that no graduate of Harvard would be guilty of such a classical hybrid.

[5] France-based cookware maker Arc International acquired Newell's European business in early 2006[6] to own rights to the brand in Europe, the Middle East and Africa.

[16] On June 12, 2023, Instant Brands filed for Chapter 11 bankruptcy after high interest rates and waning access to credit hit its cash position and made its debts unsustainable.

[21] The pyrex (all lowercase, introduced in 1975[22]) trademark is now used for kitchenware sold in the United States, South America, and Asia.

According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 4.0% boron, 54.0% oxygen, 2.8% sodium, 1.1% aluminum, 37.7% silicon, and 0.3% potassium.

In the late 1930s and 1940s, Corning also introduced new product lines under the Pyrex brand using different types of glass.

Its thermal shock resistance is lower than borosilicate's, leading to potential breakage from heat stress if used contrary to recommendations.

[31][35] STATS analyzed the data available and found that the most common way that users were injured by glassware was via mechanical breakage, being hit or dropped, and that "the change to soda lime represents a greater net safety benefit.

"[32] Because of its low expansion characteristics, borosilicate glass is often the material of choice for reflective optics in astronomy applications.

In 1932, George Ellery Hale approached Corning with the challenge of fabricating the 200-inch (5.1 m) telescope mirror for the California Institute of Technology's Palomar Observatory project.

[36] A previous effort to fabricate the optic from fused quartz had failed, with the cast blank having voids.